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Asterisk IP PBX Features

Telephony services

Voicemail System
Multiple mail folders
Voice mail can be forwarded to email
Message waiting light
Auto-attendant
Interactive Voice Response
Overhead Paging
Flexible extension logic
Multiple Line Extensions
Multi-Layered Access Control
Direct Inward System Access
Directory Listing
Conference Bridging
Unlimited Conference Rooms
Access Control
Call Queuing
ADSI Menu System
Support for Advanced Telephony Features
PBX Driven Visual Menu Systems
Visual Notification of Voicemail
Call Detail Records
Local and Remote Call Agents
Protocol Bridging
Provides seamless integration of technologies
Offers a unified set of services to users regardless of connection type
Allows interoperability of VoIP systems

Call Features

Music on Hold
Music on Transfer
Flexible mp3 based system
Volume Control
Random Play
Linear Play
Call Waiting
Caller ID
Caller ID Blocking
Caller ID on Call Waiting
Call Forward on Busy
Call Forward on No Answer
Call Forward Variable
Call Transfer
Call Parking
Call Retrieval
Remote Call Pickup
Do Not Disturb

Scalability

TDMoE
Allows Direct Connection of Asterisk PBX
Offers Zero Latency
Uses Commodity Ethernet Hardware
Voice over IP
Allows for Integration of Physically Separate Installations
Uses commonly deployed data connections
Allows a unified dialplan across multiple offices

Voice over IP Interoperability

Asterisk™ provides transparent bridging between Voice over IP protocols and traditional telephony equipment. In addition, Asterisk can transfer calls from one system to another via the Inter-Asterisk™ eXchange (IAX™) protocol.

Inter-Asterisk™ eXchange (IAX™)
H.323
Session Initiation Protocol (SIP)
Media Gateway Control Protocol (MGCP)

Traditional Telephony Interoperability

Robbed Bit Signaling Types
FXS and FXO
Loopstart
Groundstart
Kewlstart
E&M
E&M Wink
Feature Group D
PRI Protocols
4ESS
Lucent 5E
DMS100
National ISDN2
EuroISDN
BRI (ISDN4Linux)

Codec Support

GSM
G.729 (available through purchase of commercial license(s))
G.723.1 (pass through)
Linear
Mu-Law
A-Law
ADPCM
G.726
ILBC
LPC-10
MP3 (decode only)